参考链接:

https://blog.csdn.net/sweetfather/article/details/103593040

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>

#define MAX_DATA_SIZE 1024

static int convert_string2hex(unsigned char *in_data, int in_data_len, unsigned char *out_data, int *out_data_len)
{
    int i;
    int loop_count;
    int convert_point = 0;
    int mem_point = 0;
    unsigned char convert_result;
    unsigned char temp[3] = {0}; /* 为啥是3呢？ */
    
    /* 检查参数有效性 */
    if (in_data == NULL || in_data_len <= 0 || out_data == NULL || out_data_len == NULL || (in_data_len % 2) != 0) {
        printf("invalid parameters\n");
        return -1;
    }

    /* 判断是否超过16进制范围 0 ~ F */
    for (i = 0; i < in_data_len; i++) {
        if ((in_data[i] < '0') || (in_data[i] > 'f') || ((in_data[i] > '9') &&(in_data[i] < 'A'))) {
            printf("out of range\n");
            return -1;
        }
    }

    loop_count = in_data_len / 2;
    memset(out_data, 0x00, *out_data_len);
    *out_data_len = 0;

    for (i = 0; i < loop_count; i++) {
        memset(temp, 0x00, sizeof(temp));
        memcpy(temp, in_data + convert_point, 2);
        convert_point += 2;

        convert_result = strtoul(temp, NULL, 16);

        memcpy(out_data + mem_point, &convert_result, sizeof(unsigned char));
        mem_point += sizeof(unsigned char);
        *out_data_len += sizeof(unsigned char);
    }

    return 0;
}

int main(int argc, char const *argv[])
{
    // unsigned char in_data[MAX_DATA_SIZE] = {0};
    char SysUniqueID[25] = {0};

    unsigned char in_data[MAX_DATA_SIZE] = {"c06900f0c1003cde002c1f00579300ab7500857f00409300"};
    int in_data_len = MAX_DATA_SIZE;
    unsigned char out_data[MAX_DATA_SIZE] = {0};
    int out_data_len = MAX_DATA_SIZE;
    int i;

    // scanf("%s", in_data);
    in_data_len = strlen(in_data);

    convert_string2hex(in_data, in_data_len, out_data, &out_data_len);

    for (i = 0; i < out_data_len; i++) {
        printf("0x%02x ", out_data[i]);
    }
    printf("\n");


    sprintf(SysUniqueID,"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",out_data[0],
    out_data[1],out_data[2],out_data[3],out_data[4],out_data[5],out_data[6],out_data[7],out_data[8],out_data[9],out_data[10],
    out_data[11],out_data[12],out_data[13],out_data[14],out_data[15],out_data[16],out_data[17],out_data[18],out_data[19],out_data[20],
    out_data[21],out_data[22],out_data[23]);
    printf("%s\n", SysUniqueID);

    

    return 0;
}